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Bowed rotor start mitigation in a gas turbine engine

  • US 10,443,505 B2
  • Filed: 02/12/2016
  • Issued: 10/15/2019
  • Est. Priority Date: 02/12/2016
  • Status: Active Grant
First Claim
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1. A bowed rotor start mitigation system for a gas turbine engine, the bowed rotor start mitigation system comprising:

  • a controller operable to receive a vibration input indicative of an actual vibration level of the gas turbine engine and a speed input indicative of a rotor speed of the gas turbine engine, the controller generating a bowed rotor start mitigation request based on comparing the actual vibration level to a modeled vibration level at the rotor speed;

    a motoring controller operable to determine whether to reduce a motoring time determined by a risk model based on a result of comparing the actual vibration level to the modelled vibration level at the rotor speed, wherein the risk model maps core temperature model data with time data and ambient temperature data to establish the motoring time as an estimated period of motoring to mitigate a bowed rotor of the gas turbine engine; and

    a digital storage unit operable to store time and temperature data for the risk model, wherein the digital storage unit is operable to continue monitoring of temperature data while the gas turbine engine is shut down and the bowed rotor start mitigation system is operable to compare monitored temperature data with modelled temperature data to validate one or more temperature models of the gas turbine engine.

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